Bump third_party/ot-br-posix/repo from `636e53d` to `03132d3` #1136

Job	Run time
REPL Tests - Darwin	0s
REPL Tests - Linux	28m 7s
Test Suites - Darwin (no-ble-asan-clang)	1h 11m 46s
Test Suites - Linux (no-ble-tsan-clang)	1h 33m 20s
Test Suites - Darwin (no-ble-tsan-clang)	1h 58m 45s
	5h 11m 58s

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